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A student says that if the decimal expansion of a number is non-terminating, then the number must be irrational. Which example disproves this statement?

Answer and explanation

Correct answer: \(\frac{1}{3}=0.333\ldots\)

The decimal expansion of \(\frac{1}{3}=0.333\ldots\) is non-terminating, but it repeats. Since it can be written as a ratio of integers, \(\frac{1}{3}\), it is rational. In contrast, \(\sqrt{2}\), \(\pi\), and \(\sqrt{5}\) have non-terminating, non-repeating decimal expansions and are irrational. Exam tip: A non-terminating decimal is irrational only when it is non-repeating.

Related tags

Real NumbersRational NumbersIrrational NumbersDecimal ExpansionRecurring DecimalsNumber SystemsMathematicsClass 9 Mcq

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